Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd99faf6a9762bcb…

MALICIOUS

PDF

83.0 KB Created: 2021-07-03 11:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a137758abe5f2304d1ed684f1380805 SHA-1: f5fa210558a606fa4b037f840dfedd7a34547a15 SHA-256: cd99faf6a9762bcbef0ef7222131d55f20bc19f052d1a7b427d3f3f2f41b4a26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://mikllc.mn/uploads/files/januw.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/ratosiba.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/a5m85r020e3n02lsq9vku67eh2/558602595.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/nugujidufaf.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/62538673792.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/titopozaji.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32d17208e---83205143020.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/sf78rnsom13nqricipc2a0gqi2/10099281889.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/47030510746.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc248e0b8e4---figazopodojezixizovo.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/37342960390.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/t1b7qeq794v9te4qaja7e5htop/51342591714.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c93e51634---72630577780.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/28438497515.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160947677e9fa8---fogodaraxijepinavarod.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04e6f1926---21616693756.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/22684433403.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/lapozekukekiviwa.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986d228ef35---8114399257.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b97df5bc22598c5a1aa835d11c7be60e/wamuxurupaj.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42f5e6ee9a---40924006132.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/pulozase.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/kazibuxuzaler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=can+i+open+pdf+in+indesignPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 10460 bytes
SHA-256: a18910000b65dbb333b7e13f5476768f3b10eba506ed1fae2857234b07143056
font_01_sfnt_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 16672 bytes
SHA-256: 6a52199a0a7372b14ceb86b0916fc77265dbf422196adf82aad14081f98f0a29
font_02_sfnt_off000126ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.